Bug #75642 [Com]: Wrap around behaviour for microseconds is not working

Edit report at https://bugs.php.net/bug.php?id=75642&edit=1 ID: 75642 Comment by: spam2 at rhsoft dot net Reported by: marcospassos dot com at gmail dot com Summary: Wrap around behaviour for microseconds is not working Status: Open Type: Bug Package: Date/time related Operating System: OSX PHP Version: 7.2.0 Block user comment: N Private report: N New Comment: pretty sure the sad float precision problem which makes me wonder why it's called computer and not guesser Previous Comments: ------------------------------------------------------------------------ [2017-12-06 22:12:12] marcospassos dot com at gmail dot com Expected result: ---------------- 2017-12-31 23:59:59.999999 2018-01-01 00:00:00.000000 ------------------------------------------------------------------------ [2017-12-06 22:11:26] marcospassos dot com at gmail dot com Description: ------------ When adding 1 microsecond to 999999 does not increment the seconds part. Test script: --------------- // https://3v4l.org/Wl6if $date = new \DateTime('2017-12-31 23:59:59.999999'); echo $date->format('Y-m-d H:i:s.u'); echo "\n"; echo $date->modify('+1 microsecond')->format('Y-m-d H:i:s.u'); Expected result: ---------------- 2017-12-31 23:59:59.999999 2016-01-01 00:00:00.000000 Actual result: -------------- 2017-12-31 23:59:59.999999 2017-12-31 23:59:59.1000000 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75642&edit=1